These newly discovered lice species live in caves in eastern Brazil. According to an international team of entomologists? The tiny insects are a sexual revelation wrapped up in an odd ... uh ... package.

Turns out that the female louse has kind of an inflatable penis! But with spines. The team call it a "gynosome." And, it's big – up to 15 percent the length of the female's body. To mate, the female inserts the organ into the male's vagina-like pouch. Then she inflates it and keeps it there.

For up to 70 hours!

The spines hold her steady while her organ extracts sperm. When the researchers tried to pry the coupling lice apart, the male broke in two – but the gynosome didn't budge!

Sex-role reversal in animals helps scientists study sexual evolution.

And ... they get to make up words like "gynosome." Which is now stuck in your head. All. Day. And you're welcome.

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